21210123210211 has 16 divisors (see below), whose sum is σ = 24199352347968. Its totient is φ = 18416186956800.

The previous prime is 21210123210181. The next prime is 21210123210301. The reversal of 21210123210211 is 11201232101212.

It is a cyclic number.

It is not a de Polignac number, because 21210123210211 - 2⁷ = 21210123210083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210123210811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27502695 + ... + 28263376.

It is an arithmetic number, because the mean of its divisors is an integer number (1512459521748).

Almost surely, 2^{21210123210211} is an apocalyptic number.

21210123210211 is a deficient number, since it is larger than the sum of its proper divisors (2989229137757).

21210123210211 is a wasteful number, since it uses less digits than its factorization.

21210123210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55767822.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21210123210211 its reverse (11201232101212), we get a palindrome (32411355311423).

The spelling of 21210123210211 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-three million, two hundred ten thousand, two hundred eleven".